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Charge control circuit for a vehicle vacuum cleaner battery

A technology for controlling circuits and battery chargers, applied in battery circuit devices, vehicle components, circuit devices, etc.

Inactive Publication Date: 2008-03-26
SHOP VAC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite these voltage drops, the vehicle battery may still have sufficient capacity to power some low-power accessories, especially if the power consumption of these accessories may be adjusted in response to the condition of the vehicle battery

Method used

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  • Charge control circuit for a vehicle vacuum cleaner battery
  • Charge control circuit for a vehicle vacuum cleaner battery

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Embodiment Construction

[0022] The present invention generally relates to systems and circuits for charging a battery when another battery, such as a vehicle battery, is used as a power source. Controlling this charging process is useful in situations where random discharge of the source battery may be problematic. For example, use of the disclosed systems and circuits ensures that a vehicle battery maintains sufficient capacity for engine cranking, even if the vehicle battery is used as a power source to charge a secondary or auxiliary battery. The secondary battery can be used in combination to power accessories provided in the vehicle, such as a vacuum cleaner system. Operation of the disclosed circuit or system is fully automatic, maintaining the vacuum cleaner system in a standby state without operator or user intervention.

[0023] Although the disclosed systems and circuits are described herein in the context of a vehicle and in connection with application to vacuum cleaner accessories, the a...

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Abstract

Disclosed herein is a battery charger control circuit having a voltage detector to generate a signal indicative of a source voltage level to select one of a first charging mode and a second charging mode, and a charge controller coupled t the voltage detector to enable charging in accordance with one of the first charging mode and the second charging mode based on the signal from the voltage detector. The first and second charging modes establish charging at differing, non-zero rates. The source voltage level may be sampled at a sampling rate to minimize power consumed by monitoring the source voltage level.

Description

technical field [0001] The present invention relates generally to battery charging control circuits and, more particularly, to a charging control circuit for an auxiliary battery that is charged from a main vehicle battery. Background technique [0002] Charge control circuits for regulating the charging of nickel cadmium (NiCd), nickel metal hydride (NiMH), and other rechargeable batteries from a direct current (DC) source are well known. In practice, some of the circuits involved are commercially available as discrete integrated circuits (ICs). A commercially available charge controller IC is Maxim Integrated Products, part numbers MAX712 or MAX713 ( www.maxim-IC.com , Sunnyvale, CA) pin-programmable, fast-charge controller. [0003] Circuitry for charging a battery typically employs a control or feedback scheme based on an estimate of the voltage of the cell being charged. For example, a battery charging circuit can easily perform low-current charging or trickle chargi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0054H02J7/342
Inventor 尼尔·诺雷尔马克·贝尔詹姆斯·罗比塔耶
Owner SHOP VAC